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Near infrared calibration board design method

A technology of calibration template and design method, applied in the field of optical measurement, can solve problems such as the design method of active near-infrared calibration plate that has not yet been seen, and achieve the effects of strong resistance to changes in ambient light, high manufacturing accuracy and convenient use.

Inactive Publication Date: 2011-10-19
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0003] There is no report on the design method of active near-infrared calibration plate

Method used

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  • Near infrared calibration board design method
  • Near infrared calibration board design method

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Embodiment Construction

[0022] In order to better understand the technical solution of the present invention, a further detailed description will be given below in conjunction with the drawings and the design process of the calibration plate.

[0023] The invention relates to a design method of a near-infrared calibration board. The calibration board designed and produced by the method of the invention can accurately calibrate a near-infrared imaging system.

[0024] The calibration board is arranged in a 4×4 array of near-infrared light-emitting patch elements, and is connected in parallel to form a regular and consistent calibration board. Move the calibration plate in the ordinary optical measurement system calibrated by the calibration method of the liquid crystal flat screen to obtain multiple sets of images of the calibration plate, and then extract the sub-pixel coordinates of the luminous points in each set of images, and finally through the ordinary optical binocular vision measurement system...

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Abstract

The invention discloses a near infrared calibration board design method, comprising the following steps: (1) fixing paster near infrared luminous tubes on a rigid slab according to an array distribution to make a calibration board; (2) utilizing a calibrated common camera measurement system, moving the calibration board in the effective field of view of the measurement system, collecting a series of left and right images of near infrared luminous points, extracting the sub-pixel coordinates of all the luminous points in the images, carrying out a coordinate reconstruction towards all the luminous points and rotating and translating a plurality of groups of luminous point three dimensional coordinates to finally obtain the near infrared calibration board. The average error is within 0.04mm. The invention can be used for an active near infrared calibration board having the advantages of high precision, good uniformity, convenient use and strong capability of anti-environment illumination change.

Description

technical field [0001] The invention relates to a method in the field of optical measurement, in particular to a method for designing a near-infrared calibration plate applied to the calibration of a near-infrared measurement system. Background technique [0002] In the field of optical measurement, the measurement accuracy mainly depends on the calibration of the measurement system, that is, the acquisition of the internal and external parameters of the camera in the measurement system. Therefore, how to accurately calibrate the camera has always been a research hotspot. On the one hand, it is the continuous improvement and perfection of the calibration algorithm. Another aspect is how to design an accurate calibration board. If the calibration plate is inaccurate, that is, the calibration reference is inaccurate, no matter what the calibration algorithm is, accurate calibration results cannot be obtained. Therefore, the design accuracy of the near-infrared calibration b...

Claims

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Application Information

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IPC IPC(8): G01J5/02
Inventor 杨荣骞吴效明王志刚刘素娟温小艳
Owner SOUTH CHINA UNIV OF TECH
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